Optical vortices (OVs) are structured laser beams with a helical phase front \(\exp (il\varphi )\) , where \(\varphi \)  is the azimuthal angle about the optical axis \(z\)  and \(l\) , known as the topological charge (TC), is associated to a well-defined
orbital angular momentum (OAM) \(l\hbar \)  per photon[1]}, with \(\hbar \)  denoting the reduced Plank constant. Extensive studies on generation[2]}, [3]}, detection [4]}, [5]}
and manipulation[6]}, [7]} of OVs gave rise to a wide variety of emerging applications: optical communication[8]}, optical imaging[9]}, high-resolution
microscopy[10]}, optical metrology[11]} and quantum information[12]}. In the past 20 years, the diversity and complexity of the OV family have been extraordinarily expanded.
It was found that OVs are not limited to axially propagating singularities, but can exist and evolve in many exotic forms, such as vortex knots[13]}, time-varying vortices[14]}, transverse vortices[15]},
and ray-like trajectories[16]}.
